21354671321252 has 6 divisors (see below), whose sum is σ = 37370674812198. Its totient is φ = 10677335660624.

The previous prime is 21354671321189. The next prime is 21354671321267. The reversal of 21354671321252 is 25212317645312.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 21326071776256 + 28599544996 = 4618016^2 + 169114^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2669333915153 + ... + 2669333915160.

It is an arithmetic number, because the mean of its divisors is an integer number (6228445802033).

Almost surely, 2^{21354671321252} is an apocalyptic number.

It is an amenable number.

21354671321252 is a deficient number, since it is larger than the sum of its proper divisors (16016003490946).

21354671321252 is a wasteful number, since it uses less digits than its factorization.

21354671321252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5338667830317 (or 5338667830315 counting only the distinct ones).

The product of its digits is 604800, while the sum is 44.

Adding to 21354671321252 its reverse (25212317645312), we get a palindrome (46566988966564).

The spelling of 21354671321252 in words is "twenty-one trillion, three hundred fifty-four billion, six hundred seventy-one million, three hundred twenty-one thousand, two hundred fifty-two".